US4184664A - Expanding mandrel and a machine for the use of said mandrel - Google Patents

Expanding mandrel and a machine for the use of said mandrel Download PDF

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Publication number
US4184664A
US4184664A US05/897,881 US89788178A US4184664A US 4184664 A US4184664 A US 4184664A US 89788178 A US89788178 A US 89788178A US 4184664 A US4184664 A US 4184664A
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US
United States
Prior art keywords
mandrel
jaws
crank
axis
jack
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/897,881
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English (en)
Inventor
Jean P. Ouriet
Albert Recule
Georges Roll
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Commissariat a lEnergie Atomique CEA
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Application filed by Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
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Publication of US4184664A publication Critical patent/US4184664A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/16—Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving radially
    • B23B31/16195—Jaws movement actuated by levers moved by a coaxial control rod
    • B23B31/162—Details of the jaws
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/10—Expanding
    • Y10T279/1037—Axially moving actuator
    • Y10T279/1071—Lever

Definitions

  • This invention relates to an expanding mandrel and to a machine which makes use of said mandrel.
  • One of the potential applications to which the invention is primarily directed is the construction of a machine for performing inspection or testing operations on tires (tyres). Such operations can include any type of scanning or any type of rotational testing.
  • One type of expanding mandrel which is already known consists of a cylindrical body and of jaws which are usually three in number and arranged on one of the lateral faces of the body.
  • the expandable character of the mandrel jaws is obtained by so designing these latter that they are capable of displacement either radially within grooves provided for this purpose or longitudinally along a cone.
  • the jaws of mandrels of this type exert a gripping action on the exterior of the part to be machined or tested.
  • Another type of expanding mandrel which is also known is constituted by jaws having the shape of cylindrical sectors which are capable of moving radially under the action of the thrust exerted by a component of suitable shape. Mandrels of this type are capable of gripping the interior of the part. Relevant information on this subject can be obtained by referring to French Pat. No. 2,048,176 filed on June 3rd, 1969.
  • the precise object of the present invention is to provide an expanding mandrel which overcomes the disadvantages mentioned in the foregoing, especially insofar as the mandrel is capable of gripping objects which are both of large size and have highly variable dimensions. This is particularly true in the case of tires.
  • the internal diameter of a tire can be of the order of several tens of centimeters but is subject to considerable variation depending on whether it is an automobile, motor vehicle or aircraft tire.
  • the mandrel in accordance with the invention comprises a cylindrical body provided at the periphery with a plurality of jaws which are capable of radial displacement under the action of control means.
  • each jaw is supported by two radial columns which are capable of translational motion and each placed at one end of the jaw. Both support columns are driven by means of two first crank-arms rigidly fixed to two toothed wheels which are disposed in meshing engagement with each other, one toothed wheel being coupled with a second crank-arm.
  • a further distinctive feature of the mandrel lies in the fact that an actuating rod is mounted in the axis of the mandrel body and capable of translational motion along said axis, said rod being intended to actuate all the aforesaid second crank-arms which correspond to the plurality of jaws.
  • the mandrel is advantageously provided with a moving plate on its front lateral face and with contact switches mounted between the mandrel body and the moving plate.
  • the means for controlling the expansion of the jaws by means of the axial actuating rod are constituted by a pneumatic jack connected to an electrovalve and associated with a pressostat which is preset at a predetermined pressure.
  • the present invention is also directed to a machine which makes use of the mandrel as hereinabove defined and which is especially suited to operations performed on objects having variable dimensions.
  • the machine comprises:
  • a machine body comprising means for controlling the forward motion, withdrawal and rotation of the spindle,
  • means for gripping the object comprising a first set of vertical side posts rigidly fixed to a first toothed rack actuated by displacement means and a second set of vertical side posts rigidly fixed to a second toothed rack coupled to the first by means of a toothed wheel mounted on a stationary shaft,
  • means for displacing the gripped object comprising a vertical displacement jack associated with preselected position detectors,
  • FIG. 1 is a longitudinal sectional view of the mandrel in accordance with the invention and in one particular embodiment
  • FIG. 2 is a general view of the machine in accordance with the invention.
  • FIG. 3 is a diagram illustrating the operation of the means for initiating expansion of the jaws, displacement of the spindle and positioning of the object;
  • FIG. 4 is a diagram illustrating the operation of the vertical side posts for gripping the object
  • FIG. 5 is a diagram illustrating the operation of the means for vertical displacement of the object which has been gripped by the side posts;
  • FIG. 6 is a diagrammatic illustration of the control means provided on the front face of the mandrel.
  • the mandrel shown in FIG. 1 has a cylindrical body 2 and is fitted with jaws 4 at the periphery of said body (provision being made for any number such as six jaws, for example, which are uniformly spaced at angular intervals of 60°).
  • Each jaw is supported at both ends by means of two columns 6 and 8 which are capable of translational displacement in a radial direction.
  • the movement of said support columns is controlled by two crank-arms 10 and 12 respectively which are rigidly fixed to two toothed wheels 14 and 16 respectively, these latter being disposed in meshing engagement with each other.
  • the wheel 14 is further provided with a crank-arm 18, the head 20 of which engages within a housing 22 provided at the end of an axial actuating rod 24.
  • FIG. 1 shows the position of the different elements when the jaws are fully withdrawn and the actuating rod 24 takes up an end position on the righthand side.
  • the lower portion of said figure shows the position of the elements when the actuating rod has penetrated within the mandrel body and the jaws are in their position of maximum outward extension.
  • FIG. 1 There is also shown in FIG. 1 a front plate 26 which is capable of pivoting about a point 28. Both the structure and the design function of said plate will become apparent from the description give hereinafter with reference to FIG. 6.
  • FIGS. 2 to 6 illustrate a machine which makes use of the expandable jaws described in the foregoing.
  • the means shown in the figures correspond to a machine for performing an operation on a tire (tyre) but it will be readily understood that some other use could be conceived without thereby departing from the scope of the present invention.
  • FIG. 2 is a general view of a machine of this type.
  • the mandrel 30 having expandable jaws is secured to the end of a spindle 32 which is coupled to a machine body 34 provided with means for initiating movements of forward travel, of withdrawal and of rotation of the spindle 32.
  • Said machine body is associated with means 36 for gripping the object and bringing this latter to a position in which it can be gripped by the mandrel 30, and with means 38 for performing an operation on the object.
  • the means 36 for gripping the object comprise a first set of vertical side posts 40 and 42 and a second set 44 and 46, said side posts being controlled by means of a toothed rack system 48 driven by a jack 50 as will become clearer in the description given below with reference to FIG. 4.
  • the complete assembly of vertical side posts and of the gripped object is capable of vertical displacement by means of a screw jack 52.
  • the machine is further provided in the lower part of this latter with a support plate 54, the central portion 56 of which is constituted by a freely movable sliding plate which serves to restore the tire to the vertical position at the time of clamping by means of the side posts.
  • said means can be constituted by probes 58 which are capable of displacement on support brackets 60; said support brackets can be locked in positions adapted to the dimensions of the tire.
  • Said probes can be constituted by any measuring detector which may or may not be in contact with the tire (ionizing radiation detector or infrared detector, sonic or ultrasonic detectors, capacitive or inductive transducers and so forth).
  • FIG. 3 is a diagram which serves to illustrate the principle of operation of these different elements.
  • the means described above in connection with FIGS. 1 and 2 are again shown in this figure and bear the same references but are shown in diagrammatic form.
  • This figure also illustrates the structure of the means for controlling the expansion of the jaws and the movement of the spindle.
  • These means are constituted by a pneumatic jack 62 which produces action on the axial rod 24.
  • the movement of said axial rod 24 serves to modify the spacing of the jaws 4 of the mandrel 30.
  • the pneumatic jack 62 is controlled by electrovalves 64 and 66 respectively for expansion and withdrawal of the jaws.
  • Said electrovalves are connected to pressostats 68 and 70 respectively for expansion and withdrawal.
  • Said pressostats are preset at predetermined pressures and are capable of closing the electrovalves with which they are associated in order to stop the operation which controls the movement of the jaws.
  • Advance and withdrawal of the spindle are obtained by means of a pneumatic jack 72 controlled by electrovalves 74 and 76 respectively for withdrawal and advance of the spindle.
  • Contact switches 82 and 84 serve to establish the range of travel of the spindle.
  • the movement of rotation of said spindle is produced by a motor 78 coupled to the spindle body 32 by means of a free wheel 80.
  • the movement of closure of the vertical side posts for producing a clamping action is obtained by means of a jack 50 in accordance with a mechanism which is shown in greater detail in FIG. 4.
  • These means make it possible to grip the tire on which a testing operation is to be performed and comprise said pneumatic jack 50 which is controlled by electrovalves 90 and 92 respectively for the movement of separation and closure of the side posts.
  • the electrovalve 92 is connected to a pressostat 93 which is preset at a predetermined pressure.
  • a control rod 94 is coupled to the first set of vertical side posts (only the front post 40 appears in the figure) which is rigidly fixed to a toothed rack 96.
  • Said rack is disposed in meshing engagement with a wheel 98 mounted on a stationary shaft 100 and in turn disposed in meshing enegagement with a second toothed rack 102 which supports the second set of vertical side posts, only the post 44 being shown in the figure.
  • the assembly is completed by position detectors 104 associated with a selecting screw jack 106 and a limit switch 108.
  • the operation of the means described in the foregoing takes place as follows.
  • the jack 50 controls the displacement of the rod 94 and the clamping or release of the vertical side posts.
  • the pressure within the rear chamber of the jack 50 increases during the clamping action of the side posts and the action of the jack is discontinued when said pressure attains the set pressure established within the pressostat 93.
  • the means 104, 106 and 108 serve to preset the initial position of the side posts as a function of the dimension of the object to be gripped.
  • FIG. 5 illustrates the means for producing a vertical displacement of all the side posts.
  • Said means are essentially constituted by a screw jack 52 and a set of position detectors 112 (top position) and 113 (bottom position).
  • the detectors 112 are preset so as to stop the operation of the jack 110 when all the vertical side posts and the object gripped have reached the suitable height at which the object is located in the axis of the mandrel.
  • the means for advancing the spindle and the mandrel are actuated in order to ensure that said mandrel penetrates into the interior of the tire.
  • FIG. 6 shows a front plate 26 placed in front of the mandrel body 2 and capable of moving about the point 28 and contact switches 116 mounted between said plate and said mandrel body.
  • the front plate 26 of said mandrel comes up against the tire and actuates the switches 116, thus making it possible to interrupt the forward travel of the spindle in order that such faulty positioning may be remedied.
  • the first operation consists in carrying out a preselection of the means for controlling the position-setting of the tire, namely means 104 for determining the position of the vertical side posts and means 112 for determining the range of vertical displacement of all the side posts.
  • the selecting jack 106 is in the correct position, a signal is emitted by the switch 108 which initiates opening of the side posts by means of the electrovalve 90 which produces action on the pneumatic jack 50. The machine is then in readiness for loading.
  • the operator introduces the tire on which it is desired to perform an operation by placing the tire on the sliding plate 56 of the bottom plate 54.
  • the tire-clamping order is given and the pneumatic jack 50 controlled by the electrovalve 92 initiates closure of the vertical side posts.
  • the pressure rises to the point of coincidence with the pressure which has been set in the clamping pressostat 93. This set value of pressure is determined during preliminary tests as a function of different types of tires.
  • the pressostat 93 then cuts-off the current supply to the side post closure electrovalve 92.
  • the pressostat 93 transmits an order to the jack 52 for initiating the upward movement of the side posts. This upward displacement takes place until the means 112 indicate that the center of the tire is located in the axis of the spindle, this being effected by emission of an order for stopping the vertical displacement system 52 and initiating the forward movement of the spindle.
  • Said spindle is then advanced by the jack 72 under the control of the electrovalve 76.
  • the position detector 82 cuts-off the supply of current to the electrovalve 76.
  • the jaw-expansion order is given by means of the detector 82 to the electrovalve 64 which controls the pneumatic jack 62.
  • the pressure within the jack 62 rises to the point of coincidence with the pressure which has been set in the pressostat 68.
  • this set value of pressure is determined beforehand by means of tests carried out as a function of different types of tires.
  • the change of state of the pressostat interrupts expansion of the jaws whilst the jack 62 nevertheless remains supplied in order to ensure correct and continuous application of the tire against the jaws.
  • the order for separating the side posts is given to the jack 50 by means of the jaw-expansion pressostat 68, whereupon the downward motion of the side-post system is initiated.
  • the tire is then in position for a testing operation.
  • the operator moves the probes 38 by hand towards the tire until they come into contact with this latter.
  • the position of the probes is determined by means of position detectors which can serve if necessary to energize probe-positioning safety relays in order to prevent ineffective scanning rotation which may result from a badly positioned probe.
  • the operator can set the spindle in rotation after having positioned the tire at the desired point by means of the free wheel 80. Setting in rotation is carried out by starting-up the motor 78. The rotation can be stopped either manually or automatically by means of a position detector.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Supply And Installment Of Electrical Components (AREA)
US05/897,881 1977-04-22 1978-04-19 Expanding mandrel and a machine for the use of said mandrel Expired - Lifetime US4184664A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7712176A FR2387722A1 (fr) 1977-04-22 1977-04-22 Mandrin expansible et machine utilisant ce mandrin
FR7712176 1977-04-22

Publications (1)

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US4184664A true US4184664A (en) 1980-01-22

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US05/897,881 Expired - Lifetime US4184664A (en) 1977-04-22 1978-04-19 Expanding mandrel and a machine for the use of said mandrel

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US (1) US4184664A (de)
DE (1) DE2817647A1 (de)
FR (1) FR2387722A1 (de)
GB (1) GB1570558A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4750682A (en) * 1986-02-11 1988-06-14 Thorn Emi Datatech Limited Drive hub assembly
US4781233A (en) * 1984-03-22 1988-11-01 Williams Roy L Expandable tire hub apparatus
DE4202803C1 (en) * 1992-01-31 1993-07-15 Hofmann Werkstatt-Technik Gmbh, 6102 Pfungstadt, De Method of removing tyres from wheel rims - has arms squeezing beam into wheel well controlled using arm force, arm position and wheel torque sensors
US9784646B2 (en) 2013-01-31 2017-10-10 Compagnie Générale Des Établissements Michelin Tread cracking inspection device
US10343359B2 (en) 2015-02-28 2019-07-09 Bridgestone Bandag, Llc Expandable rim for tire tread buffing apparatus and method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2541659A (en) * 1946-10-05 1951-02-13 Wingfoot Corp Apparatus for the inspection of tire treads
US2986443A (en) * 1959-05-08 1961-05-30 Leutert Friedrich Record drum mounting
US3386726A (en) * 1964-04-04 1968-06-04 Kieserling & Albrecht Clamping device
US3583674A (en) * 1968-03-21 1971-06-08 Super Mold Corp Tire inspection apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2541659A (en) * 1946-10-05 1951-02-13 Wingfoot Corp Apparatus for the inspection of tire treads
US2986443A (en) * 1959-05-08 1961-05-30 Leutert Friedrich Record drum mounting
US3386726A (en) * 1964-04-04 1968-06-04 Kieserling & Albrecht Clamping device
US3583674A (en) * 1968-03-21 1971-06-08 Super Mold Corp Tire inspection apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4781233A (en) * 1984-03-22 1988-11-01 Williams Roy L Expandable tire hub apparatus
US4750682A (en) * 1986-02-11 1988-06-14 Thorn Emi Datatech Limited Drive hub assembly
DE4202803C1 (en) * 1992-01-31 1993-07-15 Hofmann Werkstatt-Technik Gmbh, 6102 Pfungstadt, De Method of removing tyres from wheel rims - has arms squeezing beam into wheel well controlled using arm force, arm position and wheel torque sensors
US9784646B2 (en) 2013-01-31 2017-10-10 Compagnie Générale Des Établissements Michelin Tread cracking inspection device
US10343359B2 (en) 2015-02-28 2019-07-09 Bridgestone Bandag, Llc Expandable rim for tire tread buffing apparatus and method
US11059248B2 (en) 2015-02-28 2021-07-13 Bridgestone Bandag, Llc Expandable rim for tire tread buffing apparatus and method
US11951701B2 (en) 2015-02-28 2024-04-09 Bridgestone Bandag, Llc Expandable rim for tire tread buffing apparatus and method

Also Published As

Publication number Publication date
FR2387722A1 (fr) 1978-11-17
GB1570558A (en) 1980-07-02
FR2387722B1 (de) 1980-02-22
DE2817647A1 (de) 1978-10-26

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